Don't like your chances, unless you can find a 'backyarder' repairer.
Your best bet, if you need edger-specific parts, is to keep an eye out on Gumtree/eBay for a donor machine. And on nature strips, if your area has hard rubbish pickups.
Which model is it - there have been a few, from the full-crank Tilt-a-cuts onwards.
Cheers, Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."